/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package net.dreamlu.iot.mqtt.codec;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * Return Code of {@link MqttConnAckMessage}
 */
public enum MqttConnectReturnCode {

	/**
	 * 0 接受连接
	 */
	CONNECTION_ACCEPTED((byte) 0x00),
	/**
	 * 1 连接被拒绝，协议版本不可接受
	 */
	CONNECTION_REFUSED_UNACCEPTABLE_PROTOCOL_VERSION((byte) 0X01),
	/**
	 * 2 连接被拒绝，标识符被拒绝
	 */
	CONNECTION_REFUSED_IDENTIFIER_REJECTED((byte) 0x02),
	/**
	 * 3 连接被拒绝，服务器不可用
	 */
	CONNECTION_REFUSED_SERVER_UNAVAILABLE((byte) 0x03),
	/**
	 * 4 连接被拒绝，用户名或密码错误
	 */
	CONNECTION_REFUSED_BAD_USER_NAME_OR_PASSWORD((byte) 0x04),
	/**
	 * 5 连接被拒绝，未经授权
	 */
	CONNECTION_REFUSED_NOT_AUTHORIZED((byte) 0x05);

	private static final Map<Byte, MqttConnectReturnCode> VALUE_TO_CODE_MAP;

	static {
		final Map<Byte, MqttConnectReturnCode> valueMap = new HashMap<>();
		for (MqttConnectReturnCode code : values()) {
			valueMap.put(code.byteValue, code);
		}
		VALUE_TO_CODE_MAP = Collections.unmodifiableMap(valueMap);
	}

	private final byte byteValue;

	MqttConnectReturnCode(byte byteValue) {
		this.byteValue = byteValue;
	}

	public byte byteValue() {
		return byteValue;
	}

	public static MqttConnectReturnCode valueOf(byte b) {
		if (VALUE_TO_CODE_MAP.containsKey(b)) {
			return VALUE_TO_CODE_MAP.get(b);
		}
		throw new IllegalArgumentException("unknown connect return code: " + (b & 0xFF));
	}
}
